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"categories of study" is a correct and usable phrase in written English.
It can be used any time you need to refer to the different branches, topics, or divisions of an area of study. For example, "The researcher identified six categories of study related to the theory of evolution."
Exact(13)
Another set of changes would exempt eight categories of study from Common Rule requirements.
The most frequent categories of study were pharmaceutical and behavioral interventions.
Non-parametric statistical tests, e.g., Wilcoxon signed rank test and Mann–Whitney test, were employed to assess the significance of changes from baseline in vitreous haze among the different categories of study groups at month 3 and month 6.
Two main categories of study quality were included in the quality assessment tool; content quality and formal quality.
There were three main categories of study outcomes: patient-related outcomes, provider-related outcomes, and health service access and utilization outcomes.
There were three main categories of study outcomes amongst the reviews: provider-related outcomes, patient/client-related outcomes and outcomes related to health service access and utilization.
Similar(47)
Researches on stripping have been divided into three categories of field studies, laboratory investigations, and numerical and computational analysis.
There are three main categories of studies estimating climate sensitivity, which are based on: 1) very detailed climate models.
We basically distinguish three main categories of studies.
The difference between these two categories of studies was statistically significant (P = 0.04).
Among the 48 papers describing a dataset, three main categories of studies were identified: omics, medical specialties, and public health.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com